- 240440-001) p.142
lists CMPXCHG with 0F A6/A7 encodings.
Intel "i486 Microprocessor" (November 1989,
order no. 240440-002) p.135
lists CMPXCHG with 0F B0/B1 encodings...
- to 1. retry: xor eax, eax ; Zero out EAX,
because cmpxchg compares against EAX.
XACQUIRE lock
cmpxchg [locked], ecx ;
atomically decide: if
locked is zero...
- an
attempt to
eliminate overhead on
atomic operations such as the LOCK
CMPXCHG compare-and-swap instruction.
Lynnfield processors feature 16 PCIe lanes...
-
similar to the i386, with the
addition of a few
extra instructions, such as
CMPXCHG, a compare-and-swap
atomic operation, and XADD, a fetch-and-add atomic...
-
retrieved 7
March 2021 "linux-psi.git -
Linux resource pressure metrics". git.
cmpxchg.org.
Retrieved 7
March 2021. facebookincubator/oomd,
Facebook Incubator...
-
Itanium architectures this is
implemented as the
compare and
exchange (
CMPXCHG)
instruction (on a
multiprocessor the LOCK
prefix must be used). As of...
-
support for i386 processors—specifically by not
having to
emulate the
atomic CMPXCHG instruction introduced with the i486 to
allow reliable mutexes—making the...
-
instructions with an
explicit LOCK prefix: ADD, ADC, AND, BTC, BTR, BTS,
CMPXCHG, CMPXCHG8B, DEC, INC, NEG, NOT, OR, SBB, SUB, XOR, XADD, and XCHG. The...
- bsr
bswap bt btc btr bts call cbtw clc cld cli cltd clts cmc cmp cmps
cmpxchg cwtd cwtl daa das dec div
enter f2xm1 fabs fadd
faddp fbld
fbstp fchs fclex...
- B1 of the 80386 onwards.
Opcodes briefly reused for
CMPXCHG in
Intel 486
stepping A only −
CMPXCHG was
moved to
different opcode from 486
stepping B onwards...
